Some people don't need filters or put in a central filter so, having a built in filter would be redundant.

Not sure about ADSL2 but +1 to bastard . The $8 filters are the go. Pull em apart and they are almost identical inside to their more expensive siblings. The double adapter ones are a little more expensive but a good get

There's no such thing as an ADSL2+ filter, well there maybe, but an ADSL filter is an ADSL filter.

Re filters from iiNet, you be better off not getting one from them even if they were the same price. I think they are fine now, but a lot of the filters they gave out with the Belkin routers didn't filter at all.

Not all filters are equal. Some people find particular brands work better with particular phones (especially cordless phones; apparently some need an anal level of filtering such as some panasonics). For $8 though you might as well give them a try :-)

----- Anyone who uses the word 'vibe' should be fucked up the arse... or slapped. -- Billy Connolly (2006)

One that came with a D-Link USB modem I have for backup doesn't generate as much static on the phone attached to it, compared to http://www.warcom.com.au/shop/flypage/adslaccess/372 , which worked normally on the combo fax/phone machine we have but caused all hell with said DSE answering machine/phone combo. The ADSL connection also become a little bit more stable once I started using the D-Link one.

Oh, Filters aren't the only things which can cause a DSL modem to s**t itself, some modems aren't as tolerant as others. My Open 501R is much more stable than the two Billions (741GE and some later wireless model) I've used.

ADSL2+ uses a different frequency envelope to ADSL1 and ADSL2 AFAIK (Internode was able to do ADSL2 early because of this, but ADSL2+ had to wait due to different frequencies), but I doubt there would be anything that would need to change in the filter.